On 15 May 2012, at 04:02, Rodrigo Rosenfeld Rosas wrote:
> This is different and less useful for my application. That is because I'd
> like to fill the cache only in the first access no matter which client did
> request it first. Until that action is expired, only the first client should
> notice the delay in the first access. All other clients should benefit from
> this first access as well.
Use Cache-Control: public to share cached resources between clients - obviously
things like cookies and sessions can't be shared.
> Would you mind explain why it is hard to store the headers alongside with the
> body in the caches_page mechanism?
The caches_page stores static files that Apache/nginx serve up - Rails doesn't
even get hit if it's set up properly. If you meant caches_action then that's
just the way things have been historically as it's just a wrapper around
fragment caching which obviously doesn't need headers saving. Feel free to
investigate the feasibility of adding header support to action caching but be
aware that controller filters will still run for a cached action (action
caching is an around filter itself) so that things like authentication still
work so any changes need to make sure that you don't serve cached private data.
>> You can do that now using an empty option in your regexp:
>>
>> get '/products' => 'products#index', :format => /|json/
>>
>> This will match /products and /products.json
>
> Yeah, but then if I accessed /products in a cached action the returned
> content-type would be text/html, right?
You could exploit the fact that action caching still runs controller filters to
set the content_type:
TestApp::Application.routes.draw do
get 'test/index', :as => :index, :format => /|json/
get 'test/expire', :as => :expire
end
class TestController < ApplicationController
before_filter :set_content_type, :only => :index
caches_action :index
def index
render :json => params
end
def expire
expire_action :action => :index
expire_action :action => :index, :format => :json
head :ok
end
def set_content_type
self.content_type = Mime::JSON
end
end
This serves cached /test/index and /test/index.json as application/json and
/test/expire as text/html
Andrew White
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